Duplicating device



April 6, 1937. A. MARCHEV ET AL A 2,075,950

DUPLI'CATING DEVICE Filed April 4, 1935 l; Sheets-Sheet l IMI jz' j.

April 6, 1937.

A. MARCHEVl ET ALv April 6, 1937. A. MARcHEv ET Al. 2,075,950

DUPLICATING DEVICE Filed April 4,l 1955 11 sheets-sheet 3 W WN 0N UmmmMl; 1 g il wf April e, 1937.

A. M ARcHEv ET AL DUPLICATING DEVICE 11 sheets-sheet 4 Filed April 4,1955 April 6, 1937.

A. MARCHEV ET AL DUPLICATINC DEVICE 11 sheets-Sheet e Filed April 4,1935 April 6, 1937.

A. MARCHEV ET Al.

DUPLICATING DEVICE Filed April 4, 1935 A. MAR'cHEv ET AL April 6, 1937.

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Patented Apr. 6, 1937 PATENT oFFlcE 2,075,950 DUPLICATING DEVICE Alfred.Marcnev, La Grange, ana cem c. Mccain,

Glen Ellyn, Ill., assignors to Ditto, Inoorporated, Chicago, lll., acorporation of West Virginia Application Aprila, 193s, serial No. 14,648

`11 claims. (c1. 10i-132) 'Ihis invention relates to duplicatingmachines and is particularly adapted to be embodied in rotaryduplicating machines which arev provided with gelatin bands to'receiveimpressions from master sheets, which impressionsV are Vimpartedsubsequently to blank sheets brought into contact with the gelatinsurfaces.

'The primary object of the invention is to provide a rotary duplicatingmachine oi' thecharacter described which is compact, light in weight,eicient in operation and simple in construction, simple to adjust andoperate, and having relatively few parts to wear so that'it may beoperated over a long period of time without injury to itself or to thepaper stock which is fed to it.

The invention resides primarily in a combination of improved means 'forseparating and advancing the copy sheets tothe impression drum, aligningthe copy sheets with the drum, pressing the copy sheets against themaster impression on.

the drum, and removing the printed sheets from the drum.

It is also an object of the invention to so construct each of themechanisms enumerated above that it will cooperate efiiciently with theother mechanisms to insure continuous satisfactory operation of themachine even in the hands of an f unskilled operator. For example, theimproved description progresses, reference being had to the accompanyingdrawings wherein-` Fig. 1 is a plan view of a rotary duplicating machinewhich embodies the invention;

Fig. 2 is a side elevation of the machine with a part of one side framebroken away;

Fig. 3 is a side elevation of a portion of the mechanism shown in Fig. 2illustrating a changed position of the means for holding the automaticsheet feeding mechanism out of operative position;

Fig. 4 is a section taken on the line 4--4 of Fis. 3;

Fig. 5 is a section taken on the line 5-5l of section taken on the line6 6 a section' taken on the line 9-9 of a portion of the gelatin bandFig. 13 isa section taken on the line I3-l3 of Fig. 12;

Fig. 14 is a section taken on the line I l-Il of Fig. 1;

Fig. 15 is a section taken on the line I E-IS of Fig. 14;

Fig. 16 is a section taken on the line IB-IB of Fig. 6;

Fig. 17 is a section taken on the same line as Fig. 16 showing a changedposition of the mechanism;

Fig. 18 is a section taken on the line l8|8 of Fig. 1;

Fig. 19 is an enlarged fragmentary plan view of a portion of the copysheet aligning mechanism on the feed table;

Fig. 20 is a'plan view like Fig. 19 showing a changed position of themechanism;

Fig. 21 is a. section taken on the line 2I-2I of Fig. 19;

Fig. 22 is a section taken on the line 22-22 of Fig. 19;

Fig. 23 is a perspective view of the guide plate forguiding .the copysheets to the impression drum; v i v Fig. 24 is a fragmentaryperspective view of 'one end ofthe guide plate shown in Fig. 23 with acooperating trip lever;

Fig. 25 is a fragmentary sectional view taken v on the line 25`25 ofFig. 5;

Fig. 26 is a fragmentary sectional view taken i trated, the referencecharacter 30 represents gen- `erai1y a frame which comprises side 'frameJ members 3| and 32, these members being secured to each other in spacedrelation by tie rods 33, 33a, 34 and 35. It will be noted that the sideframes have their peripheral edges flanged inwardly as indicated inFigs. 2 and 5, at 36 and 31, and at the bottom the flanges 36 and 31have ears such as 38 and 39 to which are secured feet such as 48 forsupporting the machine. The tie rods 33 and 34 also support a shelfmember 4| which rests upon sleeves 42 and 43 provided at the oppositeends of the tie rods 33 and 34 and is held down tightly in place bysuitable ears, 45 punched out of the side frames 3| and 32. This shelfmember 4|, which serves also as a reenforcing plate to give addedrigidity to the machine, is turned up at the forward end of the machineas shown at 46 in Fig. 2. At the rear end of the machine, the member 4|follows the contour of the anges 36 and 31 on the side frames 3| and 32upwardly past the tie rod 35. Directly over the tie rod 35, the edge ofthe member 4| is provided with an inwardly extending ange 41 (see Figs.1 and 5).

Rotatably Journalled in theside frames 3| and 32 is a shaft 48 whichcarries an imprespression drum comprises spaced disks 5| and 52 whichare secured by means of hubs 5|a` and 52a to shaft 48. These disks haveinwardly extending peripheral anges\53 and 54 in which an arcuateimpression member 55 is secured. It will be noted from an inspection ofFig. 5 that, at the periphery of the disks 5| and 52, recesses 56 and 51are provided by anging the disks outwardly and bending them back toprovide the anges 53 and 54. The ends of the arcuate impression member55 are seated in the recesses 56 and 51. The member 55 does not extendvall the way around the disk. 'Ihis leaves an opening between the endsthereof, and these ends have inwardly directed flanges 53 and 59 shown`best in Fig. 10, the flange 59 being provided with suitable apertures 68for the passage of fingers 6| of a guide member 62 which guides copysheets 93 to the stripping mechanism.

This guide member 62 is carried on a shaft 63, the opposite ends ofwhich are journalled in the disks 5| and 52, and is normally retractedby springs 64 (see Fig. 10) which are connected to suitable ears 65punched out of the disks. From an inspection of Fig. l0, it will benoted that two of such ears 65 are provided in each disk 5| and 52although only one is used. The reason for this is that the disks arepunched identically and so. therefore, may be used at either the righthand or left hand end of the impression drum.

"qhe arcuate member 55 has the usual gelatin coated fabric band 66stretched around its periphery, this band being provided with clips 61and 68 at its opposite ends. 'Ihe clip 61 is hooked over the inturnedflange 59 of the arcuate member 55. The end of the band 66 to which theclip 61 is attached has suitable apertures as indicated at 61a (seeFigs. 10, 12, and 13) for the passage of the stripping fingers 6|. 'I'heclip 68 is hooked over the free edge of a flange 69 provided on a shaft1li which extendsfrom disk 5| to disk 52 and which is rotatablyjournalled in the disks for tightening the band. The band 66 vis heldtaut by a pawl and ratchet mechanism shown most clearly in Fiss. 5 and10.

This mechanism consists of a ratchet wheel 1| xed on the shaft 19 and apawl 12 pivoted by means of a screw 13 on the disk 52. Spring 14 holdsthe pawl 12 in engagement with the ratchet wheel 1|, but the pawl may bereleased by pressure on a finger piece 15 when it is desired to removethe band from the drum. At the opposite end of the shaft 19 fromtheratchet wheel 1|, there is aiixed to the shaft a nger piece 16, by meansof which the shaft may be rotated the necessary amount to draw the bandtaut on the impression member 55. The impression member 55 may desirablybe provided with openings 11 to prevent air pockets beneath the band 66.

f The hubs 5|a and 52a in addition to carrying the disks 5| and 52, alsocarry a driving gear 18 shown in section in Fig. 5 at the left hand endof the impression drum as riveted to the hub by the same rivets whichhold the end disk 52. A cam 19 is also xed to the hub 52a by theserivets. Hub 5|a has riveted thereto a cam 30. Cams 19 and 83 fixed tothe impression drum in this mannergserve to operate certain other partsof the machine which will be more fully described hereinafter.

Referrin-g again to gear 13 (Fig. 10), this gear is made up of two sheetmetal blanks whereby to provide a light strong gear at a very low cost,the two blanksl being cut and then pressed together and held in positionby the rivets which secure them to the hub. The main driving gear 18drives a feeding roller 8| which cooperates to strip them from theimpression drum. The

ate gear 84 which is mounted on a stub shaft l with a platen roller 82and a stripping roller 83 to feed copy sheets to the impression drum andmounted in the side frame 32 and meshing with The roller 8| isjournalled at itsv opposite ends in suitable bearings provided at 36'and81 (Figs. 10 and 15) This roller has spaced knurled portions 83separated by reduced portions 39 with which guide fingers on a paperguide 9| coinvcide. The knurled portions 88 are adapted to engage copysheets 93 fed between the roller 3| and the platen roller 82 andstripping roller 33 respectively to thus feed the sheets to the drum inco-operation with the platen roller 82 and strip them from the drum inco-operation with the stripping roller 83. The fingers of the paperguide 9| are adapted to be depressed into the reduced portions 89 .ofthe roller 8| in a manner which will be hereinafter more clearlyexplained.

Platen roller 32 is preferably composed of rubber and iscarried upon ashaft 94. This shaft at its opposite ends'is journalled in bearings 95and 96 (see Figs. 6 to 10) which bearings are so mounted in the sideframes 3| and 32 as to permit movement thereof toward and away fromtheimpression drum. The mountings of the bearings and 96 are illustrated indetail in Figs. '1, 8 and 9, and comprise guides 91 struck up from theside frames and turned in toward each other to provide guiding lflangesriding in cooperating slots provided in the bearings 95. The bearingsare yieldingly pressed toward the impression drum and the feed roller 8|by plungers 98 of which there is one at each end of the shaft 94. Eachof the plungers 9.8-has a rounded head end 99 seating iii acorresponding recess, in the top of the bearing 95. A spring l0l isinterposed between the top of the head 99 and the flange of the sideframe. 'Ihe upper end of the plunger sticks through an opening providedin the flange of -the side frame and has a pin l02 therein to preventthe plunger from being forced down too far by the spring |0l.

'Ihe stripping roller 83 is carried on a shaft |08 which is journalledin bearings |04 and |05 (see Fig. 6) mounted on the side frames 8| and82 in the same fashion as bearings 95 and 96 are mounted. Plungers 98a,similar in every respect to plungers 98, engage bearings llll-and topress them upwardly to press the stripping roller 83 against the roller8l. Springs |08 press the plungers 98a upwardly, and these springs bearagainst ears |01 struck up from the side frames 3l and 32, which earsare provided with openings through which the plungers 98a extend. theseplungers being also provided with suitable pins |02a to prevent theirbecoming detached from the ears |01.

The paper guide 9| cooperates with the platen l At its opposite ends,this sheet metal strip las bearing portions |09 and l09a curved aroundthe rod |08 to. pivotally mount the paper guide. The lower portion ofthe paper guide has ears l|0 and lllla projecting beyond the upperportion of the guides'at the opposite ends, and these `projecting earsl|0 and |l0a are connected-by means of springs I|| and Illa to lugs ll2and ll2a (see Figs. 6, 10, and 11), the springs Ill and llltir beingunder tension so as'to normally hold the paper guide in the positionshown in Fig. 10, that is to say in a position to hold the ngers 90thereof above the level of the knurled portions'88 ofthefeed roller 8|.

'I'he paper guide 9| also comprises an upperl guide plate l|3 whichextends upwardly and rearwardly at an acute angle to the portion of thepaper guide having the fingers 90 thereon.

The upper guide plate ll3 has its rearmost portion l|3a bent upwardlyslightly more than the main body portion thereof. This upper guide plateis secured at its opposite ends by means of rivets to two strips lll andI lla which are formed on levers |l'l and ll1a. Levers ll'| andv lila.are fixed on a rock shaft ll8 which is journailed in the side frames 3|and 32. 'I'he levers ll1 and ll1a operate to press down the paper guide9| by means of their fingers ||6 and IlGa.

Lever l|1a has an upwardly extending portion ||1b which carries a roller|20 riding on cam 80 which, as hereinbefore described. is xed to thedrum 49 so as to rotate therewith. A spring l2l connecting an ear |22 onthe lever arm llla with a lug |28 (see Figs. 15 to 17) on the side frame3l holds the roller |20 in contact with the cam 80. As shown best inFigs. 2, 16, and .17, cam l|30 has one portion 80a of a larger radiusthan the remaining portion thereof. When the roller`-|20 is riding onthe portion 80a, it holds the lever arm ll'la in the position show-n inFig. 16, and lever ll'la through the medium-of the shaft -l'l8 alsoholds the lever ||1 in the position shown in Fig. 14 so that the fingers90 of the paper guide 9| are elevated by means ofthe springs lll andIlla so as to bear tightly against the platen roller 82 (see Fig. 10).

When the roller |20 moves off the portion 80a of the cam 80, then thespring |2| moves the lever ll'la to bring the roller against the smallerportion of the cam 80 in the position shown in Fig. 17. This brings thefingers l|8 and ||6a on the levers Il'l and l|1a down against theprojections IIS and ll5a on the paper guide to move the paper guidefingers A90 into the position shown in Fig. 11, so as to permit theplaten roller 82 to engage the knurled portions 88 of the feed roller8|. Continued rotation of the drum, after the knurled portions 89 andthe platen roller 82 engage a copy sheet 88 therebetween, causes thevfeeding of the copy sheet into the gap of the drum. Cam I8|l is solocated with respect to the position of the gelatin band on the drum astb bring the feed roller 8| and platen roller 82 into copy sheet feeding-positionwith the paper guide 9| depressed slightly before the advancingend of the duplicating band arrives opposite the nsers 90 so that thecopy sheet is fed to the duplicating band with its forward edgeprojecting,

slightly beyond the advancing end of the band. When roller 82 is in theposition shown in Fig. 17 it is actually'a feed roller.

As the advancing-edge of the gelatin band contacts the paper, which -hasbeen fed into the gap of the drum during the period'of time that roller82 contacts roller 8|, roller -82 is forced up,

wardiy away from roller 8l at an anglefcorresponding to its 'journalguides. When this occurs, see Fig. 11, roller 82 becomes a platen rolleras the pressure between it and the gelatin band is still maintained forprinting purposes.` The reason for this is the fact that the peripheralspeedof the roller 8| is about three per cent (3%) greater than that ofthe drum, a -condition that must exist for proper stripping. It isevident that it would be impractical. for the roller 82 to contactroller 8| and thedrum at the saine time under these conditions.

The means for stripping the copy sheets .from l the duplicating bandcomprises Ain part the stripping fingers 6l hereinbeforedescrihed asmounted within the drum and the co-operating memward edge of the copysheet out as indicated in Fig. 10. Fingers 6l are moved out into theposiv tion shown in Fig. 1 0 upon 'each revolution of vthe drum inamanner'which wiilnow be described. v

70 Shaft has one end projecting vthrough the end disk 8| of the drum(Figs. 2, 26 and 27). The

is riveted to the side frame 8| as shown most clearly in Fig. 15. Asindicated clearly by the `two positions in Figs. 26 and 2'1, theengagement of the arm 83a with the cam surface |24 moves 5 the strippingngers 8| out against the projecting end of the copy sheet to force itoutwardly toward the junction of the stripping roller 83 and ,feedroller 8|.

The stripping mechanism also comprises a l0 guard plate |28 shown mostclearly in Figs. 6, 10 and 11. This guard plate |28 is bolted to lugs|21 and |21a which are punched out from the side frames of the machineand is directed upwardly toward the stripping roller 83 so as to l5prevent the copy sheets from falling below the stripping roller. It isevident that stripping roller 83 is driven by the knurled portions ofthe feed roller 8| when there is no sheet between these two rollers. Thestripping mechanism also comprises a lower portion 9|a ofthe paper guide9| as illustrated most clearly in Fig. 11 where this lower portionoperates to' deect the copy sheet downwardly over a spring guide |28 toa receiving tray 29. The spring guide |28, as illustrated best in Figs.10 and 11, has one end curved around the tie rod 33a. It is thenextended forwardly and curved around the shaft ||8 and thence rearwardlyin the shape illustrated. 'I'here may be as many of the spring 30 guides|28 as is found necessary to properly direct the copy sheets into thetray |28. A freely pivoted rod |30, which is pivoted on the lowersurface of a feed table |3|, is merely for the purpose of holding thecopy sheets down in position in the receiving tray. The receiving tray|29 may be of any suitable construction. The tray shown here consists ofa sheet metal plate having its rim bent up to provide the sides of thetray, and the side edges are-extended beyond the bottom of the tray atthe front as indicated at |32 in Fig. 10. Slots arel provided in theextended side edges which slots fit .down over the tie rod 33a.

Feed table |3| comprises a sheet metal plate having a peripheral flange|33 which extends along three sides of the tray, but is cut away at theedge of the tray next to the machine as shown in Figs. 10 and 11. Sideflanges |33a and |33b of the tray are notched as indicated at |34 to lltdown over the tie rod |08, this tie rod being reduced in diameter asindicated at |35 and |38 to receive .the notches in the side edges ofthe feed tray and 'properly position it with respect to the machine.Tray |3| is connected to the receiving tray |29 bysuitable braces |38shown in Figs. 1 and 2 so as to hold the feed tray in operativeposition. The only connection of the feed trayv |3| and the receivingtray |29 -with the main part of the machine is by means of the slots ornotches at |32 on the receiving tray and at |34 on the feed tray,vhooking over the tie rods 33a and |08. These two trays can readily beremoved by lifting them oiT the tie rods, and they may 6,- then bestored within the machine as shown in dotted lines in Fig. 2 with thetray resting upon the member'4l.

The feed tray |3| further comprises meansfor properly aligning andpositioning the copy sheets to be ied to the machine thereon. For thispurpose, the feed tray is provided along the opposite sides thereof witha pair of longitudinally extending guide rails |31 and |38. Each guiderail comprises a strip of metal running lengthacuoso |40 resting on topof the tray with a central upstanding portion 4| formed by folding thestrip. 'I'his structure is shown most clearly in Figs'. 1 and 18 t22inclusive. The tray is slotted transversely as indicated by slots |42,|43, |44, and I |45, and suitable guide pins |48 are secured to theportions |40 'of the guide rails |31 and |38 and project downwardlythrough the slots |42 to |45. Beneath the tray |3|, these pins |48 areeach provided with a suitable washer |41, a spring |48, a securingcupped washer |49 and a cotter pin |50 so that the guide rails 31 and|38 are adjustably held in position on the tray 3|. This provides asimple and convenient manner of mounting the guide rails for adjustmenttoward and away from each other for different widths of sheets.

The guide rails |31 and 38 further carry metallic strips |5| and |52 ontop of the portions |39 thereof, these strips being secured by spotwelding or some other suitable means. 'I'he purpose of the strips |5|and |52 isto buckle the copy sheets upwardly at the center to facilitateseparation thereof.

In line with the strips |5| and |52, the tray has in the center thereofa rubber insert |53 providing a raised surface for the copy sheets torest upon, which raised surface produces sumoient friction to prevent anentire bundle of copy sheets from sliding on the top of the tray when atop sheet is fed therefrom. This central insert |53 is secured by meansof sheet metal trough |54 having portions ofits side walls, as indicatedin dotted lines at |55, punched in to grip the rubber and having sideanges |58 and |51 welded or riveted to the lower surface of the tray|3|.

Means are also provided on the guide rails |31 and |38 for exerting sidepressure on a bundle of copy sheets placed on a table for aligning it,which means may thereafter be released to leave the copy sheets free forfeeding. These means comprise adjustable sponge rubber pieces |58 and|58 carried by the side rails |31 and |38 respectively. The mountingsfor the pieces |58 and |59 are identical except that one is on the righthand side of the feed tray and the' other is on the left hand. side, sothe description of one mounting will sumce for both.

As illustrated best in Figs. 18 to 21, the mounting for the piece` |58comprises a slidable plate |80 having an upstanding flange |8|. Theplate |80 has at its opposite ends pins |82 and |83 which pins slide inslots |84 and |85 provided in plates |88 and |81. 'I/he plates |88 and|81 are secured to the top of the portion |40 of the guide rail and arebent upwardly as indicated at |88 and |89 for the reception of the plate|80.

It is evident that, as the plate |80 is moved from the position shown inFig. 19 to the position shown in Fig. 20, the sponge rubber piece |58carried therebywill be backed away from the copy sheets overlying themembers |5| and |52. The sponge rubber piece |58 is secured in positionby a Z-shaped plate |10 which also has end portions |1| and |12 engagingthe ends of the piece |58. The bottom of the sponge rubber piece |58rests upon a raised portion |13 of the plate |80. Vertically extendingstrips |14 and |15, extending inwardly from the flange |8| and engagingthe back of the member |10, hold the member |10 in fixed position, witha lower horizontal portion |18 thereof seated in the trough provided bythe flange |8| and the raised portion 13 of the plate |80. n

suitable bearings |82 and |83 (see Fig. 5) mounted in the side frames 3|and 32. Shaft |8| carries a second lever |84 like lever |19 except thatit carries no roller. The roller |80 is held against the surface of thecam |19 by means of a spring |85 connected to an ear |88 on the lever|19 and to a pin |81 on the side frame 32.

-Pivoted to the upper ends of the levers |19 and |84 is a U-shaped.member |88. The side frames 3| and 32 carry suitable flanged rollers|89 and |90 for guiding the legs of the U-shaped member |88 as they aremoved by the cam 19 engaging the roller |80 on the lever |19. The member|88 is composed of two side. pieces |88a and |8817, which are pivoted tothe levers |19 and |84 respectively, and a cross bar |9I. l

This cross bar has two brackets |92 and |93 riveted thereon as shown inFig. 1, and one of the'se brackets has a top plate |94 integral' there-A with running across to the other bracket-and resting on the topthereof. A feed roller carrying frame |95 has arms |98 and |91 pivotedto the free ends of the brackets A92 and |93 respectively. The arms |98and |91 have inturned lugs |98 and |99 engaging the lower edges of thebrackets |92 and |93 when the frame |95 is in the position shown inFigs. 1 and 11. Bracket |93 also carries a lug 200 (see Fig. 11) towhich a spring is secured, the other end of the spring being secured ina lug 202 turned up from the arm 91. The spring is so positioned withrespect to the pivotal connection of arms |98 and |91 to the brackets|92 and |93 as to yieldingly hold the frame |95 in either the full lineposition shown in Fig. 10 or the folded position shown in dotted linesin Fig. l0 since the spring is stretched by swinging the frame |95between these two hunting positions.

The frame |95 has pivoted thereto a sheet feeding roller 203. Thisroller may be of rubber o r other material suitable for feeding the copysheets, a shaft 204 of the roller being journalled in slots 205:1 and208a in arms 205 and 208 which are pivoted to depending ears 201 and 208(see Figs. 10, 11, and 14) of the frame |95. The

` mounting of the roller is preferably such that it will roll when thecam 19 moves from the full line position shown in Fig. 14 to the dottedline position shown in Fig. 14 to thus cause the member |88 and theframe |95 carried thereby 'to move away from the duplicating drum towardthe dotted line position shown for the frame |95 in Fig. 14. When theframe |95 is moved in the opposite direction, that is toward the fullline position shown in Fig. 14, the feed roller 203 is prevented fromturning to thus cause it to feed a sheet from the feed table 13| towardthe duplicating drum. The action just described is accomplished by a bar209 which is fastened to a plate 2|0 and projects down against theroller 203 when the roller is in the position shown in Fig. 11. Theslots 205e and 208:1 in the arms 205 and 208 for mounting the shaft ofthe roller 203 permit the roller to move when the frame |95 istravelling to thev left so as to clear the bar 2.09.

Now, however, when the frame |95trave1s to the right, the shaft 204 ofthe roller 203 slides in the slots in the arm 205 and 208 to engage therubber roller with the bar 209 and preventsv rotation of the roller. Anextension 2|| of the plate 2|0 merely serves to limit the movement ofthe roller 203 away from the frame |95 by engaging the frame.

It is sometimes desirable to feed the copy sheets to the machine by handin which case thejframe |95 can be folded up into the dotted lineposition shown in` Fig. 10. In this event, it is undesirable to have thecam 19 operating the arms |19 and |84 so as to be continually advancingand retracting the sheet feeding mechanism. Means are, therefore,provided whereby arms |19 and |84 may be moved back sufciently toprevent cam 19 from engaging roller |80. This means is shown best inFigs. 2, 3, and 4 and comprises a pair of plates 2|2 and 2|3 secured tothe side frame member 3| by means of a pin 2 |4, the outer plate 2|2carrying a finger piece 2|5. The frame 3| is slotted with an arcuateslot 2|8 concentric with the pin 2|4, and a pin 2|1 is secured by meansof a reduced extension 2|8 to the plates 2|2 and 2|3, this pin beingextended inwardly suillcient to extend into the path of the arm |84. Aspring 2|9 is connected to 'the pin 2|1 and, at its other end, ismounted on a pin 220 secured to the frame 3|, the pin 220 being directlybelow the pin 2|4.

When the operator desires to eliminate the automatic feeding and to stopthe motion of the arms |19 and |84, he merely swings the plates 2 |2 thepath of the cam 19.

The general operation of the machine will now 5 be described.

The operator places a gelatin band 88 on the impression drum 49 byhooking the clip 81 over the inturned flange 59, turning the drumclockwise to lay the band thereon then hooking clip 88 over flange 89 onshaft 10 and turning shaft 10 by means of nger piece 18 to draw the bandtaut on the drum. Ratchet wheel 1| and pawl 12 hold the shaft 10 inposition to keep the band taut.

A master sheet is next laid on the band 8.8. This master sheet may befed from table |3| by hand tothe guide member 9|. The drum is rotated tobring the gelatin band up to position to receive the master sheet. Asthe drum handle is rotated in a clockwise direction, the portion 80a ofcam 80 moves out from under roller |20 (Fig. 16) and spring |2| drawsthe arms ||1 and ||1a to the right to move the fingers ||8 and ||8a downagainst the projections ||5 and 5a on the paper guide 9| to press thepaper guide down. The knurled portions 88 of feed roller 8| are thusengaged with the master sheet and advance the master sheet to the drumas the rotation of the drum continues.

The master sheet is left on the gelatin as long as necessary by stoppingthe drum before it has been rotated sufficiently to bring the advancingend of the master sheet to the stripping roller 83.

Now the operator may place a bundle of copy sheets upon the feed table|3| and by pushing the guide rails |31 and |38 towards each otherposition lthe bundle accurately. The bundle is now bowed up between itsends by rubber friction pad |53 and the strips |5| and |52 and is readyfor feeding. Sheets may be fed by hand from the top of the bundle intoengagement with the margin stop provided by paper guide 9| and theplaten roller.

When automatic feeding is desired the sponge rubber sheet separatingpads |58 and |59 may 10 be engaged with the sides of the bundle bysliding the plates |50 operated by cam slots |84 and pins |52 towardsthe bundle. These pads |58 and |89 pressing against the sheet edges in.the bundle tend to hold them in place as th'e top sheet is being pulledoif. When the pads are positioned the operator lowers feed rollercarrying frame |95 down to the dotted line position shown in Fig. 10 tobring the roller 203 into engagement with .the top sheet of the bundle.Further operation of 2O the machine will cause the sheets to beautomatically fed to the drum.

To start the automatic feed, the operator must move the plates 2|2 and2|3 into the position shown in Fig. "2 so as to move pin 2|`| away from25 lever |84. The spring |85 wil then swing levers |19 and |84 towardthe drum axis so that roller |80 rides on the cam 19 as the drum rotatesand causes a rocking movement of levers |19 and |84. This rockingmovement causes reciproca- 30 tion of the U-shaped member |88 which inturn reciprocates the frame |95 in synchronism with rotation of the drum49.

Upon movement of the frame |95 away from the drum, the roller 203 mayslide in its bearings '35 so as to move away from the bar 209 and so itrolls over the copy sheets. Upon the return movement of the frame towardthe drum the roller slides in its bearings until it engages the bar 209and then during the remainder of the 40 movement: of frame |95 towardthe drum, the

roller 203 is prevented from rotating by bar 209 and therefore by itsfrictional engagement with the top sheet of the bundle of copy sheetsadvances the top sheet to the margin stop provided 45 by paper guide 9|and platen roller 82.

As shown most clearly in Fig. 10, the position of cam 'I9 with -respectto the gelatin band 86 on the drum is such that when the cam '|9 hasmoved the frame |95 to the limit of its move- 50 ment toward the drum,the advancing end of the gelatin band is still somewhat below the paperguide 9|. Further rotation of the drum moves portion 80a of cam 80 pastthe roller -|20 on lever Illa to allow the spring |2| to move levers 55and ||`|a clockwise from the position shown in Fig. 16 to thepositionrshown in Fig. 17. The fingers 90 on guide 9| are moved down bythis operation to permit feed roller 8| Aand platen roller 82 to advancethe copy sheet to the drum so 60 that the forward edge of the copy sheetprojects beyond the advancing end of the gelatin band. i

Rotation of the drum carries the copy sheet around until its forward endis approaching the 65 stripping roller. l

27, arm 83a on shaft 53 engages the cam surface |24 of bracket |25 andmoves the stripping lingers 8| out against the projecting end of thecopy sheet and directs the sheet toward the stripping 70 roller 88.Stripping roller 83 is driven by the knurled portions 88 of roller 8|and when the copy sheet reaches the junction of the rollers 88 and 8|,it is fed by them out beneath portion 9Ia of r paper guide 8| and overthe guide |28 into the 85 receiving trayV |28.

As shown best in Figs. 26 and u copy sheets.

While certain embodiments of the invention have been shown and describedit will be understood that it is capable of many modifications. Changes,therefore, in the constructionand arrangement may be made-withoutdeparting from 5 the spirit and scope of the invention as disclosed inthe appended claims in which it is the intention to claim all noveltyvinherent in the invention as broadly as permissible in view of the priorart. l0

Having thus described the invention what we claim as new and desire tosecure by Letters Patent is:

1. In a duplicating machine, an impression drum, means for rotating saiddrum, a platen 15 roller, a feed roller cooperating with said platenroller to advance copy sheets to the drum, and means interposed betweenthe feed roller and the platen roller cooperating with the platen roherto provide a margin stop for copy sheets.

2. In a duplicating machine, an impression drum, means for rotating saiddrum, a platen roller, a feed roller cooperating with said platen rollerto advance copy sheets to the drum, and means interposed between thefeed roller and the platen roller cooperating with the platen roller toprovide a margin stop for copy sheets, said means comprising a paperguide having a guide slot for the copy sheets through which the sheetsare directed to said rollers and having flngers extending between thefeed roller and platen roller.

3. In a duplicating machine, an impression drum, means for rotating saiddrum, a platen roller, a feed roller cooperating with said platen rollerto advance copy sheets to the drum, and means interposed between thefeed roller and the platen roller cooperating with the platen roller toprovide a margin stop for copy sheets, said means comprising a paperguide having a guide slot for the copy sheets through which the' 40sheets are directed to said rollers and having ngers extending betweenthe feed roller and platen roller, said guide being movable by rotationof said drum to control passage of copy sheets between said rollers.

4. In a duplicating machine, an impression drum, means for rotating saiddrum, a platen roller, a feed roller cooperating with said platen rollerto advance copy sheets to the drum, means interposed between the feedroller and the platen roller cooperating with the platen roller toprovide a margin stop for copy sheets'and to hold the copy sheets awayfrom the feed roller and means-actuated by rotation of said drum towithdraw the margin stop and render the feed roller operative to feedcopy sheets -to the drum.

y5. In a duplicating machine, a duplicating drum, a platen roller forpressing copy sheets against said drum, a stripping roller for strippingsheets from said drum, anda third roller cooperating with said firstnamed rollers to feed a fresh copy sheet to said drum and to strip thecopysheet from the drum after it has passed around the drum.

8. In a duplicating machine, a duplicating v drum, a platen roller forpressing copy sheets against said drum, a stripping roller for strippingsheets from said drum, and a third roller cooperating with said firstnamed rollers to feed a fresh copy sheet to said drum and to strip thecopy sheet from the drum after it has passed around the drum and meansinterposed between said third roller and the platen roller cooperatingwith the platen roher to provide a margin stop for '7. In a duplicatingmachine, a duplicating drum, a platen roller for pressing copy sheetsagainst said drum, a stripping roller'for stripping sheets from saiddrum, and a third roller cooperating with said first named rollers tofeed a fresh copy sheet to said drum and to strip the copy sheet fromthe drum after it has passed around the drum, and a copy sheet guidemeans on said drum for directing the forward edgegof the copy sheet tosaid stripping roller.

8. In a duplicating machine, a duplicating drum, a platen roller forpressing copy sheets against said drum, a stripping roller for strippingsheets from said drum, and a third roller cooperating with said firstnamed rollers to feed a fresh copy sheet to said drum and to strip thecopy sheet from the drum after it has passed around the drum, a copysheet guide means on said drum for directing the forward edge of thevcopy sheet to said stripping roller and means interposed between saidthird roller and the platen roller cooperating with the platen roller toprovide a margin stop for copy sheets.

9. In a duplicating machine, a frame, a duplicating drum rotatablyjournalled therein and having a duplicating band on the peripherythereof, a copy sheet feed table, a platen roller, a copy sheet guidecooperating with said platen roller to provide a margin stop for thecopy sheets,

means to release said margin stop to permit advance of the sheet to thedrum, and stripping means for stripping the copy sheet from the drum,said stripping means including a roller which also cooperates with saidplaten roller to advance copy sheets to the drum. A

10. In a duplicating machine, a frame, a duplicating drum rotatablyjournalled therein and having a duplicating band thereon, a copy sheetfeeding means, a platen roller, a guide plate having fingers cooperatingwith said platen roller to provide a margin stop for the fed copysheets, and means driven from said drumv for withdrawing said n'gers topermit advance of the copy sheet to the drum, said platen roller beingmounted for movement away from the drum and away from said fingers, andspring means urging the platen roller toward said drum and toward saidfingers.

11. In a duplicating machine, a copy sheet tableA and means thereontoposition a bundle of copy sheets on said table, said means comprisingguide rails on said table movable toward and away from each other andyielding bundle engaging pads movably mounted on said guide rails andmeans for adjusting said pads toward and away from the bundle of copysheets between said guide rails while the guide rails are stationary.

12. In a duplicating machine, a copy sheet table and meansthereon toposition a bundle of copy sheets on said table, said means comprisingguide rails on said table movable toward and away from each other andyielding bundle engaging pads movably mounted on said guide rails andmeans for adjusting said pads toward and away from the bundle of copysheets between said guide rails while the guide rails are stationary',said table having a friction pad thereon projecting up from the surfacethereof.

13. In a duplicating machine, a. frame, a duplicating drum and copysheet feeding and stripping l means for said drum comprising a feedroller driven from said drum and platen and stripping rollers driven bysaid feed roller.

14. In a duplicating machine, a frame, a duplicating drum rotatablyjournalled therein and having a duplicating band thereon, a platenroller 'adapted' to press copy sheets against said duplicating band,means providing a margin stop for copy sheets alongside said platenroller, means including a driven feed roller adapted to press ,copysheets against said platen roller and cooperate with said platen rollerto advance the sheets to the drum, said platen roller being mounted formovement away from said drum and away from said feed roller, and meansoperating in synchronism with said drum for moving said" 'from said feedroller, and means operating in synchronism with said drum for movingsaid platen roller away from said driven feed roller, said last namedmeans comprising cam means rotating with the drum, and means fixed tosaid margin stop means and actuated by said cam to.

lift said platen roller.

16. In a duplicating machine, a frame, a duplicating drum rotatablyjournalled therein and having a duplicating band thereon, a platenroller adapted to press copy sheets against said duplicating band, meansproviding a margin stop for copy sheets alongside said platen roller,means including a driven feed roller adapted to press copy sheetsagainst said platen roller and cooperate with said platen roller toadvance the sheets to the drum, said platen roller being mounted formovement away from said drum and away from said feed roller, said marginstop means being movable with the platen roller, and means operating insynchronism with said drum for moving said platen roller away from saiddriven feed roller.

17. In a duplicating machine, an impressionV drum, means for rotatingsaid drum, a platen roller, a feed roller cooperating with said platenroller to advance copy sheets to the drum, and means interposed betweenthe feed roller and the platen roller cooperating with the platen rollerto provide a margin stop for copy sheets, said platen roller and saidmargin stop means being movably mounted, and means operating insynchronism with the rotation of the drum for holding the margin stopmeans and platen roller in position to prevent copy sheets receivedthereby from contacting said feed roller during a portion of therotation of the drum.

ALFRED MARCHEV.

CECIL C. McCAIN.

